Driwing device



" Aug.3,1943. R, Q ALLEN 2,325,728'

' DRIVING DEVICE Filed May 6, 1942 m WI T]- A W IRW H l 5 ATTORNEY.

it rw aa 3.1943

spike guiding element ,of 1 the guiding position. k I, 1 Other objects will bein partobvious and in part pointed out hereinafter. f ,1 In the drawing accompanying this specification v ;and in which similarreference numerals refer tosimilar parts, i i

Figure lis an elevation,par,tlyt in section, of

end of a hammer tool, 7

' drivingmember from the casing,"

flfhis inyention relates .toodrivhm i 18ml zm ikewig-rihe mrtionlmfithast m We,

i more. particularlyto a driving devioaadw edzier attachment .toa

. n umetica vactogtea h i 4 0 r. driving railroadql spige 3 One object of the inventionis'toprotect. a non age r breakage.

'stltuent-part iofxthe driving device againstfiam more specific obi ect prevent complete.

:10. the driving device in 3 compression of the springserving .toi hold the.

the drivingdevice showing it applied to the front Figure 2 is a transverse view Figure 1 on the liner-2, and

; taken through rei state "a. a ents a mean.-

ndj Cprrliiariy iork, N. Y., acorpora "1914 Enli hten; ff

Figure 3-is a view similarto Figure 1illustrat ing the manner in which the springelement 01.1

the driving device is protected from injury by the driving member whenever the driving 'device assumes a position in which the guiding elementc-r sleeve member of the guiding device is iully.

retracted upon the driving member." Referring more particularly to the-drawing,

the driving device, designated ingeneral by 20,

is inmany respects similar to that disclosed :in

' United States Patent No. 2,272,760granted to me February 10, 1942. It, accordingly, comprises a driving member 2| having a sleeve member or:

it thiamine:fisembmrer; g "j. stem Zi l- Sidrwardly iota-therein): 13311 0 we .ieud asainsttne..cqilarand at uiqthemndasainst a shoulder in the boretforholding the sleeve 22 normally in a forwardly position on the drivj. ingfmember so that apart of the reducedportionof the bore will lie forwardly'of the Stem 3| to receive the head of the spike j23 for holding the. driving device Y in substantially .the correct driving relation with the head of the spike, This,

forward limitingposition of: "the sleeve upon the 1 stem 3| is determined by a spring-ring 38 ar rangedin the rearward end of the bore to engage thecorresponding end or the col retaining the sleeve upon the stem.

A difliculty frequently. experiencedduring the i driving ofa spike with a power-driven hammer i tool is that of maintaining thedriving member in drivingposition upon the spikewhen the spike r sleeve andthe spike head. i v 1 V r By reason of the rapidity at which the hammer rslegve tmonlthedrivineimember: mime head approaches the rail flange. Under these circumstances, the sleeve element of the driving i {device will also engage the rail flange and during the subsequent driving of the spike the stem 3| moves through the sleeve so that frequently little or no engagement. exists between the wall of the p tool operates the entire device is subjected to guide 22 slidable thereon for maintaining the driving devic'e' in driving relation witha spike 23intendedto be driven into a tieH-for securing 1 l a rail 25 thereto.

The shank 26 of the driving member- 21 extends into the end oia percussive toolcasing 21 torreceive theblow s of a hammer piston 28 and the driving device is normally maintained in the cor rect relation with respect to, the hammer piston l by a-retainer spring 29 having a coil, or coils; at one end in interlocking engagement with the 1 periphery of the casing 21. The forward :endot the spring interlockingly engages a shoulder 30;

a on the driving member to'p'revent ejection of said .AS ln the structure shown in the aforesaid patent, the stem 3| of the driving member II engagement with the "wall of the borefl inthe between its seats member. V V t v It is accordingly contemplated herein to prevent the application of damaging blows to the spring, within the sleeve, and to thisend the bore 34 of the sleeve is provided with an intermediate portion 39 of smaller diameter than the portion 'j oi the bore containing the collar-32 to normally serveas areceptacle forthe" forward coils. of the I Q spring 3B.- A shoulderlfl istherebyprovided at i the rearward end of the portion 39 of the bore to. carries a collar 32 intermediate its ends and the 1 peripheral surface 33 of said collar is inslidable suchsevere vibration that the. striking end of the stem often slides off ofthe spike head, say to t the'position illustrated in Figure 3 of;the drawing, so that the end of the sleeve may rest upon the spike. K Any blows thereafter delivered to the.

driving member may'have the effect, in certain 3 cases; to impel the driving member forwardly inthe sleeve with such force as .to'crush the spring. j-l;

on the sleeve andthe driving serve as an abutment for the collar 32 for limit.-

rearwardly upon the stem 3 l.

3 .ing the distance which the sleeve 22 may move The intermediate portion 39 of the bore is of somewhat greater length than the length of, the spring when fully compressed so that when the c'o1lar 32 engages the shoulder '40 suitable clearames will exist between the coils of'the spring 36 to preclude the chances of driving them into contact with each other; Thus, in the event that during; the driving of a spike the driving device assumes a positionin which the sleeve is caused to move to its rearmost limiting position with respect to the stem 3| the force thereafter delivered to the driving member will be transinitted to the sleeve instead of to the spring-"and y the latter will, therefore, be fully protected against injury. I

I claim:

1., A driving device for use with a percussive tool having a casing and a reciprocatory hammer therein, comprising a driving member extending ,into the casing to receive'the blows of th'hamr men a sleeve' member' slidable on the driving memberto maintain the driving member in driv-.

fing relation with an element intended to be=driven, ashoulder on the driving membena shoulder on the sleeve member} a compression spring in :the sleeve member toseat'against the shoulders V for holding the sleeve member in a limiting posi'-.

tion upon the driving member, and an abutment feachother.

.011 one ofsaid membersjior theshoulder 0n the other said member to limit slidable movement of the sleeve member in one direction on the driving member and thereby prevent the forcing of the coils'of the spring against each other.

2. A driving device for use with a percussive tool having a casing and a reciprocatory hammer therein, comprising a driving member extending into the casing to receive the biows' of the hama rearwardly direction upon the driving member, 7

and a compression spring in an intermediate portion ofthe bore to seat against the shoulder for moving the sleeve in a forwardly direction vupon the driving memberrand, being of shorter lengthhen 11119 compressedthan the length" of such intermediate portion of the bor-e to prevent the forcingof the coils of the spring against ROY o; ALLEN. 

